fix: add varibla for public url to config file

setup

@@ -71,6 +71,7 @@ if [ $CONFIG_EXISTS == "false" ] || [ $USE_EXISTING_CONFIG == "n" ]; then
     echo "KIMAI_VERSION="$KIMAI_VERSION >> config
     echo "KIMAI_HOST_IP_ADDRESS="$KIMAI_HOST_IP_ADDRESS >> config
     echo "KIMAI_HOST_PORT="$KIMAI_HOST_PORT >> config
+    echo "KIMAI_PUBLIC_URL="$KIMAI_PUBLIC_URL >> config
     echo "KIMAI_SUPERADMIN_MAIL="$KIMAI_SUPERADMIN_MAIL >> config
     echo "KIMAI_SUPERADMIN_PASSWORD="$KIMAI_SUPERADMIN_PASSWORD >> config
     echo "KIMAI_DB_HOST="$KIMAI_DB_HOST >> config